A lead screw is a kind of mechanical linear actuator that converts rotational motion into linear motion. Its operation relies on the sliding of the screw shaft and the nut threads with no ball bearings between them. The screw shaft and the nut are directly moving against each other on a large contact area, so higher energy losses due to friction are produced. However, the designs of lead screw threads have evolved to minimize friction.http://www.remotioner.com/lead-screw/
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